Why is end-tidal CO2 monitoring important in a clinical setting?

• A. It is the best method to detect tube placement into the trachea and assess CPR chest compressions
• B. It is used to measure blood pressure
• C. It confirms oxygen flush
• D. It predicts patient age

Answer: (A)

End-tidal CO2 monitoring measures the CO2 level at the end of each exhaled breath, which reflects both ventilation and pulmonary perfusion. Because CO2 appears in the air only after it has traveled from the lungs, detecting a CO2 waveform confirms the airway is in the trachea rather than the esophagus, making it the most reliable way to verify tube placement quickly and continuously.

During CPR, the amount of CO2 exhaled is tied to the effectiveness of chest compressions and overall circulation. A consistent, rising ETCO2 indicates better perfusion and quality compressions, while a sudden drop can signal problems like a disconnection, a blockage, or reduced cardiac output. This dual capability—airway confirmation and real-time feedback on resuscitation quality—is why end-tidal CO2 monitoring is so valuable in a clinical setting.

It's not used to measure blood pressure, nor does it confirm an oxygen flush, and it has no role in predicting a patient’s age.